package cn.book.util;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public class MyBatisUtil {
    private static SqlSessionFactory factory;

    static { //类在加载过程中就会执行静态代码块的内容(即在静态代码块下，factory只会被创建一次)
        try {
            InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
            factory = new SqlSessionFactoryBuilder().build(is);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //创建SqlSession对象
    public static SqlSession createSqlSession() {
        return factory.openSession(false); //true为自动提交，false表示开启事务控制
    }
    //关闭SqlSession对象
    public static void closeSqlSession(SqlSession sqlSession) {
        if (sqlSession != null) {
            sqlSession.close();
        }
    }

}

